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    The importance of the light spectrum in a high-throughput phenotyping lab concept: evaluating transpiration and biomass growth of different banana cultivars under different blue/red light ratios

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    Journal Article (854.2Kb)
    Date
    2020-03
    Author
    van Wesemael, J.
    Swennen, R.
    Roux, N.
    Carpentier, S.C.
    Type
    Journal Article
    Review Status
    Peer Review
    Target Audience
    Scientists
    Metadata
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    Abstract/Description
    The Bioversity International Musa Germplasm Transit Center holds the world's biggest collection of banana biodiversity (>1500 accessions). We aim to characterize this banana diversity for its suitability for specific agro-ecological conditions. To achieve this characterization, a lab-based model is needed to rapidly and objectively determine growth. Identifying a suitable light source that can help mimic relevant agro-ecological conditions is a challenge. LED lights are the most economical way to illuminate growth chambers, but the spectrum of LED lamps does not resemble that of natural daylight. Red light supplemented with blue light promotes growth of several plant species and suggests that blue light is important. However, the effect of blue light on transpiration, dry matter production and photosynthesis remains unclear as it might differ according to the plant species. In this study, we monitored plant growth and transpiration of two strategically selected banana cultivars under three different spectra. The final degree of stomatal opening is determined by the balance between impulses to open (the strength of the (blue) light signalling) and impulses to close (abscisic acid detection triggered by, for example, high vapour pressure deficit, high CO2 or low soil water potential). The transpiration rate is lower in light conditions enriched in red light (blue/red 1:4). Blue light is beneficial for transpiration; however, the transpiration rate of equal blue and red intensities (blue/red 1:1) is still higher than the blue-enriched spectrum (4:1 blue/red). Under a certain light intensity, there seems to be a saturation point of blue light quantity causing an increase in transpiration and therefore growth. In banana-growing regions, the proportion of blue and red wavelengths within the solar spectrum are equal. We show that a light spectrum simulating this natural ratio results in the highest transpiration. Therefore, we recommend equipping banana growth chambers with LEDs emitting a spectrum with red and blue wavelengths of equal intensity.
    https://dx.doi.org/10.17660/actahortic.2020.1272.2
    Multi standard citation
    Permanent link to this item
    https://hdl.handle.net/20.500.12478/6922
    IITA Authors ORCID
    Rony Swennenhttps://orcid.org/0000-0002-5258-9043
    Digital Object Identifier (DOI)
    https://dx.doi.org/10.17660/actahortic.2020.1272.2
    Research Themes
    Biotech and Plant Breeding
    IITA Subjects
    Agronomy; Banana; Biodiversity; Genetic Improvement; Plant Breeding; Plant Genetic Resources
    Agrovoc Terms
    Biodiversity; Phenotypes; Growth; Transpiration; Dynamics; Agroecology; Biomass
    Regions
    Asia; South Asia
    Countries
    India
    Hubs
    Eastern Africa Hub
    Journals
    Acta Horticulturae
    Collections
    • Journal and Journal Articles4835
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